81355174 has 8 divisors (see below), whose sum is σ = 122075640. Its totient is φ = 40663296.

The previous prime is 81355147. The next prime is 81355213. The reversal of 81355174 is 47155318.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2662 + ... + 13030.

It is an arithmetic number, because the mean of its divisors is an integer number (15259455).

Almost surely, 2^81355174 is an apocalyptic number.

81355174 is a deficient number, since it is larger than the sum of its proper divisors (40720466).

81355174 is a wasteful number, since it uses less digits than its factorization.

81355174 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14294.

The product of its digits is 16800, while the sum is 34.

The square root of 81355174 is about 9019.7103057692. The cubic root of 81355174 is about 433.3063558485.

The spelling of 81355174 in words is "eighty-one million, three hundred fifty-five thousand, one hundred seventy-four".